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Hey Mickey could always name him an honorary prince, lol.Only Disney characters can be king or queen of a Disney castle. Them's the rules of a monarchy. It's a tradition going back generations!
I do wish the OP elaborated a bit more on this. If I had to take a guess I think this question came from the artwork and images over the years depicting Sora sitting on thrones and occasionally wearing a crown. We even got one recently with Sora in his KH3 outfit.But by king, what do you mean?